Malicious PDF — malware analysis report

Static analysis result for SHA-256 402214fb69461b8d…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 02:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 601ae534501c06172965d8721733c27e SHA-1: efb055ab31ba7d25d1793542003a6958ab585a74 SHA-256: 402214fb69461b8d707802ee491ac06fb6a7bd75520019d5dffe1fd441fff584
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, with one prominent URL pointing to 'jumiwimov.ru'. Heuristics indicate this PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, specifically as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=dungeon+master%2527s+5e+guide+pdf PDF link annotation
    • http://dosaxixapaxa.medianewsonline.com/muxogijexuvufo.pdfIn PDF document text
    • https://zaxusivu.weebly.com/uploads/1/3/5/3/135393217/4063675.pdfIn PDF document text
    • http://xitnet.fun/arteriovenous_malformation_surgical_planningcut6i.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/munotovumif.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/xijapameken_lareb_porep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gumomexad.onlinewebshop.net/c_programming_program_design_including_data_structures_malik.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/luwafuva.pdfIn PDF document text
    • http://mituzoleti.epizy.com/livro_ortopedia_e_traumatologia.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/completing_the_square_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/82321655261.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/bodhai_kodhai_video_song.pdfIn PDF document text
    • http://xepadegi.epizy.com/28424074813.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/kaxedikaxurisunug.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 5488 bytes
SHA-256: 4fe908258cfce7b26482c040a9f59e64b6d55a46e572be33719c5f13286839bd
font_01_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 10636 bytes
SHA-256: 682a6534af496a7380d0d18688fc3122bb0e84f5472b8b91b090a648bf80bc58

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